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I have a chamber and one 470ml to 800ml
But 470ml is too much for a cal.50
Against by the barrel is a rifled barrel and .50 cal so I can not change it ....
My balls are made of lead and weigh 22g but I can make heavier or lighter ...

sooooo a 15g ammo (let alone 22g) is pretty much as heavy as it can be

I was only holding the chamber size constant, not the barrel diameter (as my complaint was about the chamber size) Projectiles 15g and less for a .75" barrel would be fairly common.

I think the problem with small chambers and heavy projectiles is the energy loss from slow acceleration of the projectile; which is greatly exacerbated with a small chamber relative to projectile weight. A larger barrel would help but is not always as convenient to implement as a larger chamber (a larger barrel requires a sabot, for example).

I can tell you haven't built a working hybrid (at least not one that I've seen)!

Most paintball tanks are pressure tested to 3,000 psi (200 BAR).
You probably shouldn't stand close to it when firing at 30X mix, though.
30X will generate about 3000 psi.
When you drilled that hole in the bottom you weakened it a little.

Fnord wrote:Most paintball tanks are pressure tested to 3,000 psi (200 BAR).You probably shouldn't stand close to it when firing at 30X mix, though. 30X will generate about 3000 psi.When you drilled that hole in the bottom you weakened it a little.

That hole weakened it a lot. It will flare out and I wouldn't be surprised if one day the fitting came flying out instead of the projectile. Nice cannon, but be careful. Understand the danger that hole can present, especially around 3,000 PSI.

As discussed in private, you can post your second ignition system.
I have posted the same a LONG time ago when I wanted to turn a CO2 bottle into a hybrid.
I later decided against building a hybrid alltogether for local legal reasons.

It's the propellant normally used along with that ignition system that is outruled.

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Last edited by Brian the brain on Sat Mar 10, 2012 3:41 am, edited 1 time in total.

Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Paintball cylinders have a operating pressure of 3000psi and 4500psi are tested!

I know that weakened the hole and I will be prudent, a friend made ​​a simulation of resistance.
If the fitting flies it will not really bad because the bottle will be behind me when shooting.
my second ignition system has not black powder but a primer. I can post then?
Sure? I will not want violate the rules ...